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New portable headphone amplifier OPA132+AD815 development

post #1 of 6
5/15/10 at 6:30am
Thread Starter 
  • 4 Li-Ion mobile phone batteries 1000mAh (maybe six of them will be better?)
  • OPA132 (150uA class A bias) (is it enough? there is no perfomance difference in microcap)
  • AD815 (or THS6012; THS6182)
  • Gain 10dB
  • 10k potentiometer
  • Battery status monitor (is there any simple circuit for it?)

Any comments?

 

Amp.pngCharger.png


Edited by Ant1Xr1st - 5/16/10 at 6:18am
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post #2 of 6
5/15/10 at 2:23pm

Will you build a prototype? 

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post #3 of 6
5/15/10 at 7:32pm
Thread Starter 

Yes of course. I'm waiting for AD815 arrival.

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post #4 of 6
5/16/10 at 7:22pm

The bigger problem is that the AD815 has just been pushed into the end of life,

last time buy category and all the vendors i have checked have none in stock.

 

Looks like it would have been a great idea a few years ago.

Does not seem to be any similar chip that can work at the higher voltages.

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post #5 of 6
5/17/10 at 6:02am
Thread Starter 

kevin gilmore, THS6012 is very similar to AD815. I have choose the second one - some people say, that it has a bit cleaner sound on high frequencies.

Some pcb madskillz:

Amp_pcb_top.pngAmp_pcb_bottom.png

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post #6 of 6
6/7/10 at 7:48pm

what's the latest on this?

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